Divisional Rankings

Divisional Data Info
Please note, Degree Days and Palmer Indices are not available for Alaska. Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Illinois, Climate Division 8. Southwest

Average Temperature Rankings, August 2018

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  • Record Warmest
Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Warmest/Coolest
Since		 Record
August 2018
1-Month 		76.5°F
(24.7°C)		 76.0°F
(24.4°C)		 0.5°F
(0.3°C)		 79th Coolest
Coolest since:
 1915
50th Warmest
Warmest since:
 1936
Ties: 1923
Jul–Aug 2018
2-Month 		77.4°F
(25.2°C)		 77.0°F
(25.0°C)		 0.4°F
(0.2°C)		 82nd Coolest
Coolest since:
 1967
47th Warmest
Warmest since:
 1936
Ties: 1919, 1923, 1933, 1998
Jun–Aug 2018
3-Month 		77.6°F
(25.3°C)		 75.9°F
(24.4°C)		 1.7°F
(0.9°C)		 103rd Coolest
Coolest since:
 1915, 1927
26th Warmest
Warmest since:
 1936
Ties: 1987
May–Aug 2018
4-Month 		76.5°F
(24.7°C)		 73.2°F
(22.9°C)		 3.3°F
(1.8°C)		 125th Coolest
Coolest since:
 1967
4th Warmest
Warmest since:
 1936
Ties: 2010
Apr–Aug 2018
5-Month 		71.1°F
(21.7°C)		 69.6°F
(20.9°C)		 1.5°F
(0.8°C)		 104th Coolest
Coolest since:
 1907
25th Warmest
Warmest since:
 2010
Ties: 1921, 1953, 1986, 1998, 2005
Mar–Aug 2018
6-Month 		66.6°F
(19.2°C)		 65.5°F
(18.6°C)		 1.1°F
(0.6°C)		 99th Coolest
Coolest since:
 1904
30th Warmest
Warmest since:
 2012
Ties: 1959, 1964
Feb–Aug 2018
7-Month 		62.6°F
(17.0°C)		 61.1°F
(16.2°C)		 1.5°F
(0.8°C)		 105th Coolest
Coolest since:
 1904
24th Warmest
Warmest since:
 2012
Ties: 1932, 1936, 1999
Jan–Aug 2018
8-Month 		58.3°F
(14.6°C)		 57.3°F
(14.1°C)		 1.0°F
(0.5°C)		 94th Coolest
Coolest since:
 1912
35th Warmest
Warmest since:
 2012
Ties: 1919, 1939, 1941, 2001
Dec 2017–Aug 2018
9-Month 		55.7°F
(13.2°C)		 54.8°F
(12.7°C)		 0.9°F
(0.5°C)		 87th Coolest
Coolest since:
 1904
41st Warmest
Warmest since:
 2012
Ties: 1986, 2011
Nov 2017–Aug 2018
10-Month 		54.8°F
(12.7°C)		 53.8°F
(12.1°C)		 1.0°F
(0.6°C)		 94th Coolest
Coolest since:
 1904
34th Warmest
Warmest since:
 2012
Ties: 1939, 1946, 1949, 1952, 1988
Oct 2017–Aug 2018
11-Month 		55.3°F
(12.9°C)		 54.1°F
(12.3°C)		 1.2°F
(0.6°C)		 100th Coolest
Coolest since:
 1904
28th Warmest
Warmest since:
 2012
Ties: 1938, 1986, 2011
Sep 2017–Aug 2018
12-Month 		56.6°F
(13.7°C)		 55.3°F
(12.9°C)		 1.3°F
(0.8°C)		 103rd Coolest
Coolest since:
 1904
25th Warmest
Warmest since:
 2012
Ties: 1922, 1972
Mar 2017–Aug 2018
18-Month 		60.1°F
(15.6°C)		 58.7°F
(14.8°C)		 1.4°F
(0.8°C)		 107th Coolest
Coolest since:
 1904
21st Warmest
Warmest since:
 2012
Ties: 1991, 2008
Sep 2016–Aug 2018
24-Month 		57.7°F
(14.3°C)		 55.4°F
(13.0°C)		 2.3°F
(1.3°C)		 124th Coolest
Coolest since:
 1979
3rd Warmest
Warmest since:
 2017
Ties: 2000
Sep 2015–Aug 2018
36-Month 		58.1°F
(14.5°C)		 55.4°F
(13.0°C)		 2.7°F
(1.5°C)		 125th Coolest
Coolest since:
 1979
1st Warmest
Warmest to Date
 2018
Sep 2014–Aug 2018
48-Month 		57.3°F
(14.1°C)		 55.4°F
(13.0°C)		 1.9°F
(1.1°C)		 123rd Coolest
Coolest since:
 1980
2nd Warmest
Warmest to Date
 2019
Sep 2013–Aug 2018
60-Month 		56.6°F
(13.7°C)		 55.3°F
(12.9°C)		 1.3°F
(0.8°C)		 110th Coolest
Coolest since:
 1906
14th Warmest
Warmest since:
 2020
Ties: 1956, 1957, 2007

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